We calculate the current response to a static vector potential in disordered superconductors. In contrast to standard BCS theory which violates gauge invariance, it is important here to incorporate the coupling to phase fluctuations in order to obey charge conservation. At strong disorder, where the system breaks up into superconducting islands, the superfluid stiffness is determined by percolative current paths which form via a 'constriction' process from the homogeneous situation.
Current Correlations in Strongly Disordered Superconductors / Seibold, GOTZ ULRICH; Benfatto, Lara; Castellani, Claudio; Lorenzana, J.. - In: JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM. - ISSN 1557-1939. - STAMPA. - 29:3(2016), pp. 577-580. [10.1007/s10948-015-3300-6]
Current Correlations in Strongly Disordered Superconductors
SEIBOLD, GOTZ ULRICH;BENFATTO, Lara;CASTELLANI, Claudio;
2016
Abstract
We calculate the current response to a static vector potential in disordered superconductors. In contrast to standard BCS theory which violates gauge invariance, it is important here to incorporate the coupling to phase fluctuations in order to obey charge conservation. At strong disorder, where the system breaks up into superconducting islands, the superfluid stiffness is determined by percolative current paths which form via a 'constriction' process from the homogeneous situation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
